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<a name="boost_asio.tutorial.tuttimer3.src"></a><a class="link" href="src.html" title="Source listing for Timer.3">Source listing for
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<pre class="programlisting"><span class="comment">//</span>
<span class="comment">// timer.cpp</span>
<span class="comment">// ~~~~~~~~~</span>
<span class="comment">//</span>
<span class="comment">// Copyright (c) 2003-2025 Christopher M. Kohlhoff (chris at kohlhoff dot com)</span>
<span class="comment">//</span>
<span class="comment">// Distributed under the Boost Software License, Version 1.0. (See accompanying</span>
<span class="comment">// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)</span>
<span class="comment">//</span>

<span class="special">#</span><span class="identifier">include</span> <span class="special">&lt;</span><span class="identifier">functional</span><span class="special">&gt;</span>
<span class="special">#</span><span class="identifier">include</span> <span class="special">&lt;</span><span class="identifier">iostream</span><span class="special">&gt;</span>
<span class="special">#</span><span class="identifier">include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">asio</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>

<span class="keyword">void</span> <span class="identifier">print</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&amp;</span> <span class="comment">/*e*/</span><span class="special">,</span>
    <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">steady_timer</span><span class="special">*</span> <span class="identifier">t</span><span class="special">,</span> <span class="keyword">int</span><span class="special">*</span> <span class="identifier">count</span><span class="special">)</span>
<span class="special">{</span>
  <span class="keyword">if</span> <span class="special">(*</span><span class="identifier">count</span> <span class="special">&lt;</span> <span class="number">5</span><span class="special">)</span>
  <span class="special">{</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="special">*</span><span class="identifier">count</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="special">++(*</span><span class="identifier">count</span><span class="special">);</span>

    <span class="identifier">t</span><span class="special">-&gt;</span><span class="identifier">expires_at</span><span class="special">(</span><span class="identifier">t</span><span class="special">-&gt;</span><span class="identifier">expiry</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">seconds</span><span class="special">(</span><span class="number">1</span><span class="special">));</span>
    <span class="identifier">t</span><span class="special">-&gt;</span><span class="identifier">async_wait</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(</span><span class="identifier">print</span><span class="special">,</span>
          <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">placeholders</span><span class="special">::</span><span class="identifier">error</span><span class="special">,</span> <span class="identifier">t</span><span class="special">,</span> <span class="identifier">count</span><span class="special">));</span>
  <span class="special">}</span>
<span class="special">}</span>

<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
<span class="special">{</span>
  <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_context</span> <span class="identifier">io</span><span class="special">;</span>

  <span class="keyword">int</span> <span class="identifier">count</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
  <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">steady_timer</span> <span class="identifier">t</span><span class="special">(</span><span class="identifier">io</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">seconds</span><span class="special">(</span><span class="number">1</span><span class="special">));</span>
  <span class="identifier">t</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(</span><span class="identifier">print</span><span class="special">,</span>
        <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">placeholders</span><span class="special">::</span><span class="identifier">error</span><span class="special">,</span> <span class="special">&amp;</span><span class="identifier">t</span><span class="special">,</span> <span class="special">&amp;</span><span class="identifier">count</span><span class="special">));</span>

  <span class="identifier">io</span><span class="special">.</span><span class="identifier">run</span><span class="special">();</span>

  <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Final count is "</span> <span class="special">&lt;&lt;</span> <span class="identifier">count</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>

  <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
<span class="special">}</span>
</pre>
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<div class="copyright-footer">Copyright © 2003-2025 Christopher M.
      Kohlhoff<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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